package cn.myframe.utils;

import com.alibaba.druid.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;

/**
 * IP地址
 * 
 * @author chenshun
 * @email sunlightcs@gmail.com
 * @date 2017年3月8日 下午12:57:02
 */
public class IPUtils {
	private static Logger logger = LoggerFactory.getLogger(IPUtils.class);

	/**
	 * 获取IP地址
	 * 
	 * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
	 * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
	 */
	public static String getIpAddr(HttpServletRequest request) {
    	String ip = null;
        try {
            ip = request.getHeader("x-forwarded-for");
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } catch (Exception e) {
        	logger.error("IPUtils ERROR ", e);
        }
        
//        //使用代理，则获取第一个IP地址
//        if(StringUtils.isEmpty(ip) && ip.length() > 15) {
//			if(ip.indexOf(",") > 0) {
//				ip = ip.substring(0, ip.indexOf(","));
//			}
//		}
        
        return ip;
    }
	
	/*public static boolean isWindowOS() {
		boolean isWindowOS = false;
		String osName = System.getProperty("os.name");
		if (!StringUtils.isEmpty(osName) && osName.toLowerCase().indexOf("windows") > -1) {
			isWindowOS = true;
		}
		return isWindowOS;
	}*/
	
	public static InetAddress getServerIp() throws UnknownHostException, SocketException {
		InetAddress inetAddress = null;
		InetAddress inet = null;
		// 如果是windows操作系统
		/* boolean bFindIP = false; */
		// 定义一个内容都是NetworkInterface的枚举对象
		Enumeration<NetworkInterface> netInterfaces = (Enumeration<NetworkInterface>) NetworkInterface
				.getNetworkInterfaces();
		// 如果枚举对象里面还有内容(NetworkInterface)
		while (netInterfaces.hasMoreElements()) {
			/*
			 * if (bFindIP) { break; }
			 */
			// 获取下一个内容(NetworkInterface)
			NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
			// 遍历所有IP
			Enumeration<InetAddress> ips = ni.getInetAddresses();
			while (ips.hasMoreElements()) {
				inetAddress = (InetAddress) ips.nextElement();
				if (inetAddress.isSiteLocalAddress() // 属于本地地址
						&& !inetAddress.isLoopbackAddress() // 不是回环地址
						&& inetAddress.getHostAddress().indexOf(":") == -1) { // 地址里面没有:号
					/* bFindIP = true; */ // 找到了地址
					/* break; */ // 退出循环
					inet = inetAddress;
				}
			}
		}
		return inet;
	}
	
	public static void main(String[] args) throws UnknownHostException, SocketException {
		System.out.println(IPUtils.getServerIp().getHostAddress());
	}
}
